ronald reagan's second term -- >> a few months ago, i told the american people i did not trade arms for hostages. my heart and my best intentions still tell me that's true, but the facts and evidence tell me it is not. >> reporter: the iran contra affair. bill clinton -- >> i did not have sexual relations with that woman. >> reporter: impeached after the lewinsky mess. and george w. bush, well, there was the valerie plame spygate scandal, not to mentioning the handling of hurricane katrina. that's trouble for roughly 100% of re-elected presidents since 1972. yes, it's enough to give you second thoughts about that second term. so is there anything the obama team can do to prevent this? now, as bill clinton might say. >> it depends upon what the meaning of the word "is" is. >> reporter: the fact is, if there is going to be a second-term scandal, its seeds were probably sewn in the first term. the watergate break-in, nixon's first term. the actual iran contra deal, reagan's first term. bill clinton's liaison with lewinsky, first term. the actual plame leaks, first term. so if the obama tea